How pptx.gallery works

Two audiences, one catalog

The gallery serves two co-equal audiences. Every page is designed for both.

The OPF contract

OPF (Open Presentation Format) is the open presentation format specified at openpresentation.org. An OPF document describes a presentation as a collection of named choices — “use the modern-minimal color scheme, the aptos font scheme, the problem-solution narrative” — instead of a pile of raw pixels.

Those names need a canonical home. Somewhere an agent or a human can look them up and see what they mean. That’s the gallery.

Every gallery item’s slug is a stable OPF identifier. Changing a slug is a breaking change across the entire ecosystem, so they don’t change without a very good reason.

Gallery dimensions

Each dimension catalogs a category of OPF-named design choice. Fourteen dimensions, all sourced from the OPF schema.

For AI agents

The gallery is built to be consumed programmatically. Today you can rely on:

• Stable URL structure: /{dimension} for index, /{dimension}/{slug} for detail.
• Per-item metadata on every page: JSON-LD structured data, Open Graph tags, and canonical URLs.
• sitemap.xml enumerating every catalog page and how-to article.
• llms.txt discovery at pptx.gallery/llms.txt.
• JSON API routes per live dimension (e.g. /api/layouts.json, /api/charts.json) with structured catalog data.

Full endpoint and registry-format documentation lives in the API & registry reference.

Catalog and local editing

• Catalog references. Gallery items describe named design choices. A deck names one by its id, and every OPF snippet here embeds the record it names under catalogs.default, so the deck renders the same anywhere. Open an item in the editor to use it in a deck.
• Local slide editing. The visual OPF editor supports OPF import, content and property edits, live preview, undo/redo, and PowerPoint export in your browser. Save OPF to keep your changes; OPF stays the source of truth. Text is exported one box per wrapped line today, so editing a paragraph in PowerPoint does not reflow it; an opt-in native text mode is in progress. Review exported slides in PowerPoint with the chosen fonts installed.
• Free access. No ads, no accounts, no paywalls.

Rendering notes

• Table text. Table cell text asks for the body size (about 19 pt) instead of a fixed 12 pt, so a table no longer looks small beside the bullets. The whole table shrinks together toward composition.minFontSize when its text and rows do not fit the box. A table cell style can set bold, so a number cell can be bold and still use its number format.
• Slide tag. The tag (the small eyebrow above a title) follows titleAlignment, like the title, so a layout that centres its content no longer centres the tag over a left-aligned title. A slide that sets design.contentAlignment keeps the tag on content alignment.
• Color variants. A deck, or a single slide, can run on another background of its one color scheme with design.variant (light1, light2, dark1 or dark2; the object form reorders the accents), as PowerPoint's color map does. Dark is a variant of a theme, not a theme of its own: { "design": { "theme": "classic", "variant": "dark1" } }. Picture and gradient backgrounds take a tone of dark or light instead. The theme pages list each theme's variants.
• Version. Core 0.22.0 behavior; this site uses core 0.31.0.

Ecosystem

pptx.gallery sits alongside a small family of tools that all speak OPF:

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